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Hund's Induced Fermi-Liquid Instabilities and Enhanced Quasiparticle Interactions
1European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble, France.
Physical Review Letters
|May 6, 2017
Summary
Hund's coupling can increase compressibility in Mott insulators, leading to phase separation. This mechanism may enhance superconductivity in iron-based superconductors.
Area of Science:
- Condensed matter physics
- Solid-state physics
Background:
- Mott insulators are materials that should be metallic but are insulating due to electron-electron interactions.
- Hund's coupling describes the interaction between electron spins within an atom.
- Understanding electron correlations is crucial for designing novel electronic materials.
Purpose of the Study:
- To investigate the effect of Hund's coupling on the electronic properties of doped Mott insulators.
- To explore the potential role of Hund's coupling in phase separation and superconductivity.
Main Methods:
- Theoretical analysis of a doped Mott insulator model.
- Numerical simulations of the 122 Fe-based superconductor model.
Main Results:
- Hund's coupling generally increases compressibility in doped Mott insulators, driving Fermi-liquid instability and phase separation.
- The strongest effects are observed at the boundary between ordinary and Hund's metals.
- Increased compressibility enhances quasiparticle scattering, promoting other symmetry-breaking instabilities.
Conclusions:
- Hund's coupling plays a significant role in the electronic behavior of certain correlated materials.
- The simulated physics in iron-based superconductors suggests Hund's coupling may be key to enhancing superconducting critical temperatures.
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